<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="logo" />
      </div>
      <!-- 登陆表单 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" class="login_form">
        <!-- 登录名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-password"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 登录按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定对象
      loginForm: {
        //请求参数
        username: "admin",
        password: "123456",
      },
      // 表单验证规则对象
      loginFormRules: {
        // 验证用户名
        username: [
          { required: true, message: "请输入用户名", trigger: "blur" },
          { min: 3, max: 10, message: "长度3到10个字符", trigger: "blur" },
        ],
        // 验证密码
        password: [
          { required: true, message: "请输入密码", trigger: "blur" },
          { min: 6, max: 15, message: "长度6到15个字符", trigger: "blur" },
        ],
      },
    };
  },
  methods: {
    //点击按钮重置表单
    resetLoginForm() {
      console.log(this);
      this.$refs.loginFormRef.resetFields();
    },
    // 表单登录前预验证
    login() {
      this.$refs.loginFormRef.validate(async (valid) => {
        console.log(valid);
        if (!valid) return;
        const { data: res } = await this.$http.post("login", this.loginForm); //获取请求
        console.log(res);
        if (res.meta.status !== 200)
          return (
            console.log("登陆失败"), this.$message.error("用户名或密码错误")
          );
        console.log("登陆成功");
        this.$message.success("登陆成功");

        //  1.登陆成功后的token，保存到客户端的sessionStorage中
        //  2.项目中出了登陆之外的api接口，必须在登陆之后才能访问
        //  3.token只应在当前网站打开期间生效，所以讲token保存在sessionStorage中
        window.sessionStorage.setItem("token", res.data.token);
        //  4.通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push("/home");
      });
    },
  },
};
</script>

<style scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  /* 阴影 */
  box-shadow: 0 0 10px #edd;
  position: absolute;
  left: 50%;

  transform: translate(-50%, -50%);
  background-color: #fff;
}
img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background-color: #eee;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 10px;
  box-sizing: border-box;
}
</style>